The deep gouge offers a stunning spectacle, unique in Europe, which has entrhalled eminent geologists and speleologists, including the French scholar, Edouard Martel, who was the first to discover the canyon from the bottom...

"...There exists here, I repeat, a marvel without a second in Europe. In truth, the most American of all the canyons in the Old World, and I have not changed my mind after seeing the Grand Canyon of the Colorado..."